Expansion bolt



D. R. SHERWOOD. EXPANSION BOLT.- APPLlCATlON mu) MAR. 9. 192i.

Patented May 23, 1922.

2 SHEETS-SHEET l- D. R. SHERWOOD.

EXPANSION BQLT. APPLICATION FILED MAR. 9, I921.

Patented May 23; 1922.

2 SHEET8SHEET 2.

UHTE STATES PTT Qli h'l DANIEL R. SHERWOOD. 03? PLAINZEIELI), NEW JERSEY, ASSIGI'TOR TO HENRY B.

NEWHALL, 0F PLAINFIELI), NEW] JERSEY.

EXPANSION BOLT.

Specification of Letters Patent.

Patented May 23, 1922.

Application filed. March 9, 1921. Serial No. 450,920.

To all whom it may concern Be it known that I, DANIEL R. SH RWOOD, a citizen of the United States, residing at Plainfield, in the county of Union and State of New Jersey, have made certain new and useful Improvements in Expansion Bolts, of which the following is av specification taken in connection'with the accompanying drawings.

My invention relates to expansion bolts and more particularly to the combination of an expansion bolt and a removableescutcheon plate; and also to the escutcheon plate and the expansion bolt as separate articles of manufacture. f

My invention further relates to such a combined expansion bolt and escutcheon plate having a maximum grip or hold in the wall or ceiling for a given size of expansion. My invention further relates to an expansion the outer end of which lies substantially flush with the surface of the wall or ceiling, and a removable escutcheon plate having an unbroken inner surface to lie flat against a wall, or other suitable support, and means to hold the expansion and the escutcheon plate together.

My invention further relates to certain combinations, details of construct-ion, and

articles of manufacture, which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings the same reference numerals refer to similar parts in the several figures.

Fig.1 is a vertical section through a wall,

ceiling or other suitable support showing one form .of my expansion bolt and escutcheon plate;

Fig. 2 is a fragmentary plan view;

Fig. 3 is a vertical section on the line (B g of Fig. 1, looking in the direction of the arrows;

Fig. 4 is a rear elevation of the form of escutcheon plate shown in Fig. 1;

Fig. 5 is a detail view showing the manner of assembling the expansion and the escutcheon plate;

Fig. 6 is a vertical section members assembled;

Fig. 7 is a side elevation of a modified form of my invention;

Fi 8 is a vertical sectionon the line 8-8 of Fig. 7, looking in the direction of the r ws;

showing the two Fig. 9 is a rear elevation of the inner surface of the removable escutcheon plate shown in Fig. 7;

Fig. 10 is a detail view showing the manner of assembling the escutcheon plate of F1g. 9 and the expansion shown in Fig. T;

Fig. 11 is a detail view showing the parts assembled;

Fig. 12 is a vertical section, partly in side elevation, of a modified form of my invention;

13 is a fragmentary detail plan view;

Flg. 14 is a vertical section substantially on the line 1l1 4l of Fig. 12;

Fig. 15 is a rear elevation of the escut cheon plate shown in Fig. 12;

Fig. 16 is a detail view showing the manner of assembling the expansion and the escutcheon plate shown in Fig. 12;

Fig. 17 is a detail View showing the expansion and the escutcheon plate completely assembled.

It has been proposed to secure a re1novable cap or plate to an expansion bolt, the headof which is permitted to extend out of the opening in the wall or ceiling a sufficient distance to become imbedded or seated in, and enclosed by, a hollow removable plate. Among other disadvantages this is objectionable in that the expansion is not inserted its full length in the hole and therefore its eifective expansion surface is materially lessened. To carry a given load a larger expansion is required than one in which the expansion bolt proper is inserted for its whole length within the hole.- It is further objectionable in that it brings powerful expansion force near the outer surface of the wall or ceiling which is apt to cause the surface or wall to crack around the hole, requiring a larger plate than if the expansion force was thrown well back into the hole and removed from the surface of the wall or ceiling.

Bymy invention 1 permit the full length of the expansion to be inserted in the wall, ceiling or other suitable support, and therefore insure that the powerful expansion is exerted well back from the surface of the wall or ceiling, thereby insuring both a stronger expansion for a given size of ex pansion bolt, and also protecting the sur face of the wall or ceiling from crackin or crumbling as the expansion force is app ied to the expansion bolt. This permits me to job as possible and give a finis brings the two locking 7 against the outer v use an escutcheon plate of the minimum size and therefore one requiring less metal and. cheaper to manufacture. Being relatively small it is less obtrusive and enhances the appearance of the job.

In the drawings I have shown different embodiments of my invention used in conmotion with what is known in the trade as a machine expansion. It is to be distinctly understood, however, that any form of expansion may be used whether operated by a machine bolt, a lag screw or any other suitable means.

I have shown one form ot my invention in Figs. 1. to 6 inclusive. In these figures 1 is a wall or ceiling formed of any suitable material usually of concrete. In this wall the hole 2 is formed in any suitable manner as by drilling to receive the expansion This expansion may be of any suitable form. For purposes of illustration I have shown it formed of two members 4; and 5 having parallel ribs 6-6; the two members are expanded by a wedge 7 carried by a nut '8 operated by the machine bolt 9. As this machine bolt 9 is screwed within the nut 8 it causes the nut to move between the members 4- and 5 and expand them with tremendous force. the expansion being somewhat exaggerated in Fig. 1 for pun poses of illustration.

My invention is adapted for universal adaptation and is particularly useful for hanging pipes from ceilings or walls, as for example in automatic fire sprinkling installations. It is desirable to make as neat a ied appear ance to the entire installation. By my invention the expansion 3, with the members 4 and '5 contacting with each other as shown in 7, is inserted in the hole 2. leaving only the neck 10 of the expansion out of the hole 2. Then, or prior thereto, if desired, the removable escutcheon plate 11 is secured to the expansion 3 in any suitable manner. I have shown in Figs. 1 to 6 the escutcheon plate 11 provided with looking fingers 12 and 13.

To assemble theparts, prior to the inserti-on of the machine bolt 9. the locking finger 12 is inserted in the pocket or groove 14 in the member 5. The other locking finger 13 is then brought on one'side or the other of the longitudinal axis extending through the expansion The escutcheon plate ll is then swung down in the direc tion of the arrow, as shown in Fig. 5, until the finger 13 engages in the groove 15. This fingers 12 and 13in the same vertical plane, Figs. 1 and 6, in which position the escutcheon plate is secured to the expansion. To bring the inner surface 16. of the escutcheon plate 11 flush surface 17 of the ceiling or wall 1, and also to insure that the ex pansion 3 is inserted its maximum length in the hole 2 so as to obtain the maximum hold or grip the escutcheon plate is given a soft blow with a hammer or any suitable tool so as to cause the fingers 12 and 13 to become embedded. in the concrete or other suitable matter of the wall or ceiling as shown in Fig. l. The bolt 9 is then inserted through the hole 18 in. the escutcheon plate 11 and cooperates with the nut 8 which moves between the members 4 and 5 and expands them the machine bolt is turned. This expansion is shown somewhat exaggerated in Fig. 1. It willbe noted that the expansion force takes place well back of the surface 17 of the wall or ceiling and thatthe fingers 12 and 13 also tend to prevent any expansion of the expansible members 4!: and 5, which would be sufficient to crumble or crack the surface of the wall or ceiling 17 adjacent to the hole or opening 2. A pipe or any OtllGFSlllttblG object may be suspended from the bolt 9.

lVhen the bolt 9 is inserted through the escutcheon plate 11 and engages with the nut 8 it is impossible to remove the escutcheon plate without first removing the bolt. This permits the expansion, the escutcheon plate and the bolt to be assembled and shipped as one unitary article. Of course,

it is to be understood that the-expansion and the escutcheon plate may be sold and shipped as separate articles of manufacture,

if so desired. I

In Figs. 7 to 11 I have shown another modification of my invention. in which the expansion 19, F ig. 7 has a neck 21 provided with cam grooves 22., Fig. 8. In assembling the escutcheon plate 23 andjthe expansion 19 they are brought into the positionof F 10 where the fingers 12 and 13 are about to be received in the deepest portions of the cam grooves 22 22. The escutcheon plate 23 is then moved across the end of the expan{ sion until the expansion 19 contacts with the stop 24- on the escutcheon plate. The escutcheon plate is then rotated in either direction with relation to the expansion 19 so as to bring the locking fingers 12 and 13 upon the cams 22, 22, when the escutcheon plate is secured to the expansion and ready to be inserted in the wall or other suitable support in the same manner, as described in connection with the other construction.

In Figs. 12 to 17 I have shown another modification of my invention in whichthe expansion 24 at its outer end has a neck 25 provided with a groove 26. the groovebeing provided with a hole 27. The removable escutcheon plate 28 is provided with two rela tively long locking fingers 29 and 30. In attaching the escutcheon plate 28 it is merely necessary to locatefone of the fingers, as for example 29 in the hole 27, and then rock or pivot the removable escutcheon plate" 28 upon that finger 29 in the direction. for estample. shown by the arrow in 16. until these two fingers 29 and 80 are brought in the same vertical plane as shown in 17. The machine bolt 9 then. in ted.

It will, thereftue be clear that in all :tornr; of myinrention the maximum grip will be insured for given size expansion that this expansion will be located entirely laltilill the hole and removed from the oi the Willll ceiling or other suitable i port The 03:- pansion is inserted sin'l placing it in the hole the final edit inent being ade by means of a soft blow from a hammer or mallet or any other suitable tool. The escutcheon plate being relatively small it Will take less metal and will be com iaratively inexpensive to manufacture. besides it will be inconspicuous in use.

Having: thus described this invention in connection with illustrative emliuuliments thereof, to the details of which I do not desire to be limited What is claimed as new and What is desired to secure by Letters Petent is set torth in the appended claims.

\Vhat I claim is z 1. The combination out an expansion bolt the inner surface of said plate.

a detachable c-scutcheon plate, and means to hold the end of the exnansion bolt a the inner stufjtacc oi the escutcheon plan and in substantially the same \ertical plane as the inner surface of said plate.

2. The combination oi an expansion bolt a detachable escutcheon pla A i i t hold the end of the expa the inner surface oi the escutcheon plate and in substantially the same vertical plane as An expansion bolt provided with a hole near its outer end to receive and hold a pivoting and locking finger on a removable escutclieon plate and also prwided with a groove to cooperate with another locking linger.

at. A new article oi manufacture comprising an expansion bolt and a removable Gmcu'tcheon plate lying snug against the end of the expansion bolt but not emliu'acing it and means to removably hold the escutcheon plate and expansion bolt together.

DANlEL R. SHERWOOD.

Witnesses ARTHUR H. NiLEs, C. LESTER RULE. 

